code: def test_timestamp_add_timedelta_push_over_dst_boundary(self, tz):
      # GH#1389
  
      # 4 hours before DST transition
      stamp = Timestamp("3/10/2012 22:00", tz=tz)
  
      result = stamp + timedelta(hours=6)
  
      # spring forward, + "7" hours
      expected = Timestamp("3/11/2012 05:00", tz=tz)
  
      assert result == expected
  
imports: from datetime import datetime, timedelta, timezone
  from dateutil.tz import gettz
  import numpy
  import pytest
  import pytz
  from pandas._libs.tslibs import OutOfBoundsDatetime, OutOfBoundsTimedelta, Timedelta, Timestamp, offsets, to_offset
  import pandas._testing
label_desc: Use image node_id 18 for calling the TestTimestampArithmetic obj's underlying member method code with example usage: obj.test_timestamp_add_timedelta_push_over_dst_boundary(tz) without return types